The loading screen is supposed to look like that (it's a tribute to the C64's loading screen). Just give it a minute - it's not the quickest to load.
Oh, but it still hasn't loaded for me at all though, I've left it open since then and it's the same colorful lines problem. And that was an hour ago. The past hour I went to cook and play with my pets. Came back and the screen was still the same. Unless it really is supposed to take longer than an hour?